INSTALLATION, OPERATION, AND MAINTENANCE MANUAL FOR THE HUBBELL MODEL TX / HX TANKLESS WATER HEATER

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1 INSTALLATION, OPERATION, AND MAINTENANCE MANUAL FOR THE HUBBELL MODEL TX / HX TANKLESS WATER HEATER ELECTRIC HEATER COMPANY Edition 2016A

2 HUBBELL ELECTRIC HEATER COMPANY P.O. BOX 288 STRATFORD, CT PHONE: (203) FAX: (203) INTERNET: Important Safety Information 1. You must read and follow all instructions. Serious bodily injury or death could occur if you ignore this warning. 2. All circuit breakers and/or disconnect switches servicing the heater must be turned off when installing, uninstalling, or repairing this water heater. 3. The Hubbell Tankless Water Heater must be grounded. 4. The unit must be installed by a licensed electrician and plumber. 5. The unit must be wired in accordance with the current version of the National Electrical Code (US) or Canadian Electric Code (Canada). 6. This installation must comply with all national, state, and local plumbing and electrical codes. 7. When the heater is not within sight of the electrical circuit breakers, an additional local means of disconnection of all ungrounded conductors must be provided that is within sight of the appliance or a circuit breaker lockout must be used. (Ref. NEC ) 8. If the Hubbell Tankless Water Heater is installed in a location where water damage could occur in the event of a leak, it is recommended that a drip pan be installed and connected to a suitable drain. Alternatively, an active water leak detector and shut off valve can be installed to turn off your water supply in the event a leak is detected. 9. If water supply has a high mineral content, a water softening system is recommended. Damage to the water heater resulting from scale or hard minerals will not be covered under warranty. 10. When the heater is installed in a well water system or if the plumbing system is prone to introducing air into the heater, it is highly recommended that an air separator be installed in the cold water feed to the heater to avoid possible failure of the heating element and/or heating chamber. 2

3 TABLE OF CONTENTS SECTION TITLE PAGE No. I TANKLESS WATER HEATER OPERATING PRINCIPLE 4 II GENERAL DESCRIPTION AND CONSTRUCTION 5 III INSTALLATION 9 IV OPERATION AND MAINTENANCE 25 V TROUBLESHOOTING 32 VI SERVICING & REPLACEMENT OF PARTS 38 VII PARTS LIST 42 VIII WARRANTY 43 3

4 SECTION I TANKLESS WATER HEATER OPERATING PRINCIPLE How the Hubbell Tankless Water Heater Works: For the most part, operating the new tankless water heater is very similar to using any traditional water heater system. However, it is very important that all of the set-up procedures and operating instructions are carefully read to ensure maximum performance and energy savings from the new water heater. The Hubbell Tankless Water Heater does not store hot water like a conventional tank-type water heater. It contains high powered heating elements that are capable of heating water instantly on-demand as needed. As soon as there is a hot water demand, a sophisticated flow sensor within the heater recognizes the demand and initiates the heating process. This sensor measures the water flow rate while two other sensors measure the incoming and outgoing water temperature. This information is transmitted continually to the microprocessor controller which determines the precise amount of power to send to the heating elements to heat the water to the desired temperature. The Hubbell tankless water heater only uses as much power as is needed to meet the demand by fully modulating the heating elements from 0 to 100%. It is important to keep in mind that all tankless water heaters are subject to a maximum flow rate. If this flow rate is exceeded, the heater will not be capable of fully heating water. The amount of water that can be heated by the tankless water heater at any given time will depend on the model selected and the incoming water temperature. See the charts in Section II to determine the maximum flow rates. Moreover, since a tankless water heater eliminates the ongoing thermal losses caused by storing hot water in a tank, there will be a significant energy savings compared to a conventional tank type water heater. 4

5 SECTION II GENERAL DESCRIPTION AND CONSTRUCTION Technical Specifications Common to All Models: Materials: Copper Exchanger / Low ¾ Copper, CPVC, Stainless Steel Casing Plumbing Flow or PEX Tube Energy Connection: High 98% Efficiency: Flow 1 MNPT Voltage: Volts Operating Range: psi Frequency: 50 / 60 Hz Protection: Thermal Auto Reset Product Overview: Outlet Hot Water Outlet Hi-Limit Switches Chamber s Drain Cold Water Inlet Flow Meter Ground Lug Magnetic Contactor Switching Devices (s) Inlet Control Fuse Temperature Controller (TK2000) Power Distribution Block Transformer LED Digital Display (with buttons) Notes: 1. Power distribution blocks are only installed on single phase models. 2. Magnetic contactors are only installed on 3-phase models. 3. Transformers are only installed on 3-phase models over 240 volts models will have a plug in the lowest element chamber and have only two hilimit switches and triacs installed. Typical 2/3- Model 5

6 Outlet Hi-Limit Switches Chamber Hot Water Outlet s Drains Switching Devices (s) Cold Water Inlet Inlet (beneath triac plate) Control Fuse Flow Meter Power Distribution Block Temperature Controller (TK2250) Ground Lug Magnetic Contactor Transformer LED Digital Display (with buttons) Notes: 1. Power distribution blocks are only installed on single phase models and 3-phase models that require two magnetic contactors. Single phase models use a 2-pole power distribution block. 2. Magnetic contactors are only installed on 3-phase models. One or two magnetic contactors may be installed as required. 3. Transformers are only installed on 3-phase models over 240 volts. Typical 6- Model 6

7 Pressure Drop (psi) Power (kw) Tankless Water Heater Maximum Flow Rates: Maximum Flow Rate (GPM) at Temperature Rise ( FΔT) 5 F 10 F 20 F 30 F 40 F 50 F 60 F 70 F 80 F 100 F 120 F 140 F Shaded values indicate that a High Flow (HX) unit is required. 2. Blank values indicate that the flow rate will exceed the flow capability of the flow meter. 3. For alternate power (kw) values, the maximum flow rate can be calculated using the formulas on the following page. Tankless Low Flow Pressure Drop Chart (TX): GPM 7

8 Pressure Drop (psi) Tankless High Flow Pressure Drop Chart (HX): GPM Wattage De-rating Formula: Applied Voltage 2 Rated Wattage = Actual Wattage Rated Voltage 2 For example: If installing a 27 kw unit when actual voltage is 212 V, ,944 = = ,000 W = 21, V ,600 Amperage Formula: Watts = Amps (Single Phase) Volts Watts Volts 1.73 = Amps (3-Phase) Flow Rate Formulas: To determine power (kw) requirement GPM F T = kw To determine temperature rise kw GPM = F T To determine flow rate kw F T = GPM 8

9 SECTION III INSTALLATION WARNING: Serious bodily injury or death may occur if the following warnings are ignored. All circuit breakers and/or disconnect switches servicing this heater must be turned off before installing, repairing or uninstalling this water heater. Installation of this product is restricted to indoor locations. Installation MUST be done by a licensed electrician and licensed plumber. Locating and Mounting Instructions: The Hubbell tankless water heater can be installed just about anywhere. Due to the small size of the water heater, it can be mounted in many small spaces. However, there are some important guidelines to follow that will ensure that the installation is both safe and convenient in the event that future servicing is required. This product is designed to be installed indoors only. The unit may be installed in an outdoor location as long as it is mounted in a suitable enclosure that protects it from rain, splashed water, direct sunlight, debris, and insects. This product should NOT be installed in a location where it may be subjected to freezing temperatures. If the water inside the tankless water heater freezes, it can cause severe and permanent damage that is not covered under the warranty. If you suspect that the tankless water heater may have frozen, do not turn on the heater until it has thawed and it has been inspected for leaks. When selecting an installation location, give consideration to the existing plumbing configuration, location of your main electrical panel, and location of the point of use. Try to choose a location that does not require major plumbing alterations, that is close to the main electrical panel (this will reduce the amount of wire needed to install), and that is physically close to the hot water fixtures. By locating the heater close to the points of use, this will reduce the amount of time it takes for the hot water to travel from the water heater to the point of use. Consideration should also be given to future servicing. Do NOT locate the water heater in a location that is difficult to access. In most cases, installing the tankless water heater in the same location as the old conventional tank-type water heater will make the most sense. Avoid installing the tankless water heater in a location prone to excessive humidity, moisture, or dust, or in an area where it may be splashed with water or other liquids. Do NOT install under water pipes or air conditioning lines that might leak or condense moisture that could then drip onto the heater. Do NOT install above electrical boxes or junctions. If installation of the water heater will be on a second floor, make sure that all code requirements for such installations as required for your area are followed. Hubbell recommends that a drip pan (connected to a drain) is installed below the water heater to avoid property damage in the unlikely event of a leak. Alternatively, an active water leak detector and shut-off valve designed to turn off the water supply in the event that a leak is ever detected may be installed. Mounting the unit: Leave a minimum of 12 to both sides and 4 on the top and bottom of the unit. Mount the water heater securely to the wall by putting four (4) screws through the mounting holes. Install a ¼ diameter bead of sealing caulk around the entire perimeter of the heater between the heater back panel and the wall. This prevents any moisture or debris from accumulating. 9

10 Plumbing Installation Instructions: 10 IMPORTANT INFORMATION: Ensure all fitting installations comply with local plumbing and building codes. This water heater does not require a temperature and pressure (T&P) relief valve. You may install a T&P relief valve if the county, city or state plumbing code requires it. Installations in the Commonwealth of MASSACHUSETTS and KENTUCKY require a T&P relief valve.

11 When connecting to a plumbing system that utilizes Flex or PVC, a T&P relief valve should be used as added safety. Do not connect the unit directly to CPVC pipe. You must use at least three feet of copper pipe prior to connecting to any CPVC connection. WARNING: Do not solder any pipes with the unit connected to the pipes. Doing so will damage the flow meter and void your warranty. Before energizing the heater, run water for a minimum of three (3) minutes and verify that all air has been removed. Installation of an air separator device is recommended for installations where air can be easily introduced into the water system (i.e. Well water systems, lake pumps, and other municipal systems). A shut off valve MUST be installed on inlet side of unit. A shut off valve on the outlet is recommended. Pipe Preparation: Cut the tube so that the ends are square. WARNING: Ensure that there are no burrs or damage to the cut end. This will prevent any damage to the internal o-ring. Once the tubing end is cut square and clean, mark the pipe to be installed at a distance of 1 ¾ from the end of the pipe. This is the insertion depth. Check that fittings and tubing are clean, in good condition and are free from damage and foreign objects. Flushing the Line: Before connecting the copper pipe to the water heater, it is extremely important to flush the lines to eliminate all plumbing paste, residue, or debris in the lines. Installation to Quick-Connect Fitting: Cut the pipe or tubing squarely and inspect the outside diameter of the pipe or tubing to be sure there is no damage, nicks, burrs, or debris. Deburr and clean pipe or tubing as necessary. Use the insertion depth specified in the table below. Insertion Depth Guide Size Insertion Depth ¾ CTS 1 1/8 1 CTS 1 ¼ If using PEX tubing, insert the supplied stiffener into the end of the pipe. Make certain to push the tubing completely into the fitting until it comes into contact with the internal tube stop. Insert push ring clip. Tube Stop Connect the cold water line to the water heater inlet marked cold water. Connect the hot water line to the water heater outlet marked hot water. 11

12 After inserting both fittings, open the hot water faucet and allow water to run through the water heater for at least three (3) minutes, cycling the flow on and off every minute. This process clears all the air from the lines and must be performed prior to turning on the power at the unit. WARNING: Failure to do this may damage the flow meter or heating elements and will void your warranty. Disconnecting a Joint: Ensure the system has been depressurized before removing fitting. Remove push ring clip. Push the push ring in squarely against the face of the fitting. With the push ring held securely in this position, the tubing can be removed. Checking for Leaks and Purging Air: If unit has been wired, verify all circuit breakers supplying power to the unit are turned off. Open all hot water taps supplied by the unit and inspect water connections for leaks. With all hot water taps still open, allow the water to run for a minimum of 3 minutes. Inspect each tap to ensure all air in the lines has been purged. This process purges all the air from the water lines and MUST be performed prior to turning on the power at the unit. WARNING: FAILURE TO FOLLOW THIS STEP CAN CAUSE PERMANENT DAMAGE TO THE HEATING ELEMENTS. Close all hot water taps. Typical Accessory Piping (Optional) 12

13 Electrical Installation Instructions: IMPORTANT INFORMATION: The unit must be wired in accordance with the current version of the National Electrical Code (US) or Canadian Electric Code (Canada). The unit must have its own independent circuits. When the heater is not within sight of the electrical circuit breakers, an additional local means of disconnection of all ungrounded conductors must be provided that is within sight of the appliance or a circuit breaker lockout must be used. (Ref. NEC ) Wire entry must be through the electrical KO provided in the bottom of the unit. For Canada, per Canadian Electric Code, C , the unit must be wired by a single feed installation with one (1) double-pole circuit breaker. For US, the unit may be wired by a single feed installation with one (1) double-pole circuit breaker or by a multiple feed installation with multiple double-pole circuit breakers. Wiring to the water heater: Connect the power wire from the main panel to the power distribution block or magnetic contactor as applicable. Connect the main ground wire to the ground lug in the heater. Make sure the connections are securely tightened. Electrical Specifications: Listed in the following tables are the electrical specifications for each tankless water heater model. Tankless water heaters are considered a non-continuous load. If a multiple feed installation is used, it is acceptable to install up to two conductors in one line side port. Additionally, when a power distribution block is supplied, additional conductors may be installed in an open load side port of the power distribution block. Wiring sizing listed is for 75 C THHN. 60 C or 90 C wire may be used. Refer to NEC table for sizing. Conductors should be sized to maintain a voltage drop of less than 3% under load. Electrical specifications for the High Flow (HX) models are the same as listed for the Low Flow (TX) models. For the following models, for installation in Canada per CSA requirements, a single feed is required sized as follows: o TX036-6RS: 3/0 o TX040-6RS: 4/0 o TX042-6S: 3/0 o TX048-6RS: 250 o TX048-64S: 4/0 o TX054-6S: 250 * These models indicated require that a supplementary protection assembly be installed (supplied by Hubbell). 13

14 14 Min. Breaker Size Amp Draw Model kw Volts / Phase Amps Wire Size Conduit Size Wiring Diagram TX008-2RS / ¾" TX011-3R / ¾" TX011-2S / ¾" TX011-3T / ¾" TX012-2RS / ¾" TX012-3R / ¾" TX013-3T / ¾" TX013-3T / ¾" TX014-2RS / " TX014-2S / ¾" TX014-3T / ¾" TX015-3T / ¾" TX016-3RS / " TX016-3R / ¾" TX016-2S / " TX016-3T / ¾" TX016-3T / ¾" TX018-3RS / " TX018-3R / ¾" TX018-2S / " TX018-3T / ¾" TX018-3T / ¾" TX018-3T / ¾" TX020-3RS / " TX020-3R / ¾" TX020-3T / ¾" TX020-3T / ¾" TX021-3S / " TX021-3T / ¾" TX021-3T / ¾" TX021-3T / ¾" TX024-6RS / * 1 2" TX024-6R / " TX024-3S / " TX024-3T / ¾" TX024-3T / ¾" TX024-3T / ¾" TX024-3T / ¾" TX025-3T / ¾" TX027-3S / " TX027-3T / " TX027-6T / ¾" TX027-6T / ¾" TX027-3T / ¾"

15 Min. Breaker Size Amp Draw Model kw Volts / Phase Amps Wire Size Conduit Size Wiring Diagram TX027-3T / ¾" TX030-6T / ¾" TX031-6RS / * 2/0 1 ½" TX031-6R / " TX031-6T / ¾" TX033-6S / * 1/0 1 ¼" TX033-6T / " TX036-6RS / * 3/0 1 ½" TX036-6R / " TX036-6T / ¾" TX036-6T / ¾" TX036-6T / ¾" TX040-6RS / * 4/0 2" TX040-6R / " TX040-6T / ¾" TX040-6T / ¾" TX042-6S / * 3/0 1 ½" TX042-6T / " TX042-6T / ¾" TX042-6T / ¾" TX048-6RS / * 250 2" TX048-6R / * 1/0 1 ¼" TX048-6S / * 4/0 2" TX048-6T / " TX048-6T / " TX048-6T / ¾" TX048-6T / ¾" TX050-6T / " TX054-6S / * 250 2" TX054-6T / * 1/0 1 ¼" TX054-6T / " TX054-6T / ¾"

16 Tankless Wiring Diagram 1 Outlet Fuse Temperature Controller Inlet Leak Detection Wire Hi-Limit Hi-Limit Flow Meter Power Distribution Block Tankless Wiring Diagram 2 Outlet Fuse Temperature Controller Inlet Leak Detection Wire Hi-Limit Hi-Limit Hi-Limit Flow Meter Power Distribution Block 16

17 Tankless Wiring Diagram 3 Outlet Temperature Controller Inlet Leak Detection Wire Fuse Magnetic Contactor Flow Meter Hi-Limit Hi-Limit Hi-Limit L1 L2 L3 17

18 Tankless Wiring Diagram 4 Outlet Temperature Controller Inlet Fuse Leak Detection Wire Flow Meter Transformer Magnetic Contactor Hi-Limit Hi-Limit Hi-Limit L1 L2 L3 18

19 Tankless Wiring Diagram 5 Outlet Temperature Controller Inlet Fuse Leak Detection Wire Flow Meter Transformer Magnetic Contactor Hi-Limit Hi-Limit Hi-Limit L1 L2 L3 19

20 Tankless Wiring Diagram 6 Outlet Temperature Controller Inlet Leak Detection Wire Fuse Flow Meter Hi-Limit Hi-Limit Hi-Limit Power Distribution Block Hi-Limit Hi-Limit Hi-Limit L1 L2 L1 L2 20

21 Tankless Wiring Diagram 7 Outlet Temperature Controller Inlet Leak Detection Wire Flow Meter Magnetic Contactor Fuse Hi-Limit Hi-Limit Hi-Limit L1 L2 L3 Hi-Limit Hi-Limit Hi-Limit 21

22 Tankless Wiring Diagram 8 Outlet Temperature Controller Fuse Inlet Leak Detection Wire Flow Meter Magnetic Contactor Hi-Limit Hi-Limit Hi-Limit Magnetic Contactor Hi-Limit Hi-Limit Hi-Limit Power Distribution Block L1 L2 L3 22

23 Tankless Wiring Diagram 9 Outlet Temperature Controller Inlet Leak Detection Wire Fuse Flow Meter Transformer Magnetic Contactor Hi-Limit Hi-Limit Hi-Limit L1 L2 L3 Hi-Limit Hi-Limit Hi-Limit 23

24 Tankless Wiring Diagram 10 Outlet Temperature Controller Inlet Leak Detection Wire Fuse Flow Meter Transformer Magnetic Contactor Hi-Limit Hi-Limit Hi-Limit L1 L2 L3 Hi-Limit Hi-Limit Hi-Limit 24

25 Tankless Wiring Diagram 12 Outlet Temperature Controller Inlet Leak Detection Wire Fuse Flow Meter Magnetic Contactor Hi-Limit Hi-Limit Hi-Limit L1 L2 L3 L1 L2 L3 Magnetic Contactor Hi-Limit Hi-Limit Hi-Limit SECTION IV OPERATION AND MAINTENANCE First Use of your Hubbell Tankless Water Heater: Once the water supply is on and air has been purged from the system, power the unit on at the main panel. The unit is now operating automatically. When water flows through the unit, the heating elements turn on to heat the water to the displayed setpoint temperature. When the water flow stops, the heating elements turn off. You can adjust the setpoint upward or downward by pressing the UP or DOWN button. Displaying Celsius or Fahrenheit degrees and adjusting other settings for the tankless water heater can be done via the configuration menu, described below. 25

26 26 Upper Button to Increase Temperature Digital Display Lower Button to Decrease Temperature Maintenance: The Hubbell Tankless Water Heater requires no maintenance other than to periodically check around the outside of the unit for leaks. If a water leak is detected from your water heater, turn off the water supply at the shut-off valve on the inlet side of the water heater, turn off the power to the heater at the main electrical panel and call a service technician or plumber for evaluation and repair. When any maintenance is performed on the water heater or the plumbing system that may introduce air into the water supply pipes, it is important to turn the power off to the water heater and purge the air out of the lines before restoring power to the unit. See Checking for Leaks and Purging Air in Section III. Temperature Controller User Interface Instructions: 1. To turn the unit ON and OFF: a. To turn the unit OFF, press and hold the DOWN button until display shows OFF. b. To turn the unit ON, press and hold the UP button until the setpoint temperature is displayed. c. Note that the display is always on when power is applied to the unit d. Note that the controller will preserve all its settings during any power outage or disconnect. 2. To change setpoint temperature (the temperature is fully adjustable in 1 increments). a. Press the UP or DOWN button to change the setpoint temperature. b. Pressing and holding either the UP or DOWN button will fast scroll. 3. Configuration Menu. a. To enter configuration menu, press and hold the UP and DOWN buttons simultaneously for 7 seconds. (Note that the display will change during the time you are holding the buttons. You are in the configuration menu and can release the buttons when the first character of the display is P ). b. To scroll through menu items, press the UP or DOWN button. c. To leave the configuration menu, wait 7 seconds without pushing any buttons. d. To make a change to a specific configuration menu item, simultaneously press the UP and DOWN buttons. The menu item setting will now flash indicating it can be changed. e. To scroll through menu item settings, press the UP or DOWN key. f. When the desired setting is displayed, simultaneously press the UP and DOWN buttons to lock in the selection and return back to the configuration menu. g. Configuration Menu Items: i. Power Setting - Sets the total kw rating of water heater. 1. ###, where ### is adjustable from 001 to 054 (Note that the kw selection should equal the kw based upon the actual voltage measured to the heater. Please see the nameplate on the front cover of the heater for a listing of kw ratings at various voltages). ii. Temperature Range Sets the temperature adjustment range 1. r001, 60 to 140 F (15-60 C) (Factory Default) 2. r002, 32 to 194 F (0-90 C) 3. r003, 32 to 104 F (0-40 C) iii. Display units Sets the display units to either Fahrenheit/Gallons or Celsius/Liters.

27 1. deff, for degrees Fahrenheit and Gallons. (Factory Default) 2. decc, for degrees Celsius and Liters. iv. Normal Display Mode Sets the display to show various values. 1. dsp1, to display setpoint temperature only. (Factory Default) a. setpoint is displayed as ### 2. dsp2, to display measured inlet temperature intermittently with setpoint temperature. a. Inlet temperature is displayed as i### 3. dsp3, to display measured outlet temperature intermittently with setpoint temperature. a. Outlet temperature is displayed as o### 4. dsp4, to display measured flow rate intermittently with setpoint temperature a. Flow rate is displayed as F##.#, in tenths of a gallon or liter. 5. dsp5, to display inlet temp, outlet temp, flow rate and setpoint all intermittently. v. Power Limiting Factor Sets the % of heater output allowed by the controller 1. L###, where ### is a percentage from 001 to 100 (Factory Default 100). This feature allows a user to limit the kw rating of the unit by a specific percentage and effectively lower the total amp draw of the unit. vi. Heater Configuration Sets the controller to perform calculations based on the heater configuration of the unit. 1. E001, for single-phase one heating element and all 3- phase units 2. E002, for single-phase two heating elements 3. E003, for single-phase three or six heating elements 4. E004, for single-phase four heating elements vii. Calibration Used to calibrate the heater. (For factory use only) 1. CA #, where ## equals the degrees of calibration from -3 to 3. Default is 0. viii. Low/High Flow Sets the unit as either a low flow or high flow unit. 1. LF, for low flow (Factory Default). 2. HF, for high flow. ix. Remote Control Sets the operation of the remote control function (see Priority and Remote Controls in this section). 1. ipof, disables the remote control (Factory Default). 2. iphi, 24VDC signal connected to P1 and P2 or closed relay connected to P2 and P3 will allow the heater to operate and loss of 24VDC signal or open relay connected to P2 and P3 will inhibit the heater operation. 3. iplo, 24VDC signal connected to P1 and P2 or closed relay connected to P2 and P3 will inhibit the heater operation and loss of 24VDC signal or open relay connected to P2 and P3 will allow the heater to operate. 4. When the remote control operation is inhibiting the unit from operating the display will show hld. x. Display Lock Allows the user to lock the heater parameters. When the display is locked the temperature setpoint cannot be changed and although the configuration menu will still be accessible, no changes can be made to any parameters, 27

28 except to change the display lock. With the display lock on, attempting to change the temperature setpoint will cause the display to show, Locd. 1. LcOn, to turn the display lock on. 2. LcOF, to turn the display lock off (Factory Default). xi. Software Version Displays the version number of the software 1. Sd##, where ## is the version of the display software. 2. Sb##, where ## is the version of the main board software. h. After this menu item, the configuration menu cycles back to the first item. 4. Diagnostic Menu Display a. To display common diagnostic data useful for troubleshooting, when in normal display mode press and release the UP and DOWN buttons simultaneously. b. The display will intermittently display the following values: flow rate (F##.#), measured inlet temp (i###), measured outlet temp (o###), setpoint (###). c. These values and settings will continue to display and scroll until either the UP or DOWN button is pressed. The display then returns to normal display mode. 5. Configuration Settings Display a. To display all configuration settings, when in normal display mode press and release the UP and DOWN buttons simultaneously twice. b. The display will scroll through all configuration settings. c. The display will continue to scroll until either the UP or DOWN button is pressed and will then return to normal display mode. 6. Power Rate Display a. The decimal point in the display s rightmost digit is a visual indicator of how much power is required to meet the demand. A blinking decimal point indicates that the triac is being sent POINT IS FLASHING a signal to energize and thus turn the element on. The decimal point light will blink at a faster rate as the controller is calling for more heat. When the unit is calling for full power the light is solid. b. If the amount of power required exceeds the capacity of the heater, then the entire display will intermittently flash. (Note that the display will only flash when the display configuration is set to dsp1.) 7. Cost Calculator Allows the user to view the amount of power and hot water consumed and the cost of operation. a. To display the Cost Calculator values, when in normal display mode press and release the UP and DOWN buttons simultaneously three times. b. The display will scroll through the Cost Calculator Values since last reset i. C###, where ### equals the total cost of operation ii. ####, where #### equals the total number of kw Hrs consumed iii. H0##, where ## equals water usage up to the ten thousands place, followed by h###, where ### equals water usage up to the hundreds place. Example: H012, h345 equals 12,345 gallons of water used. iv. To reset these values to 0, press and hold the UP and DOWN buttons simultaneously for 5 seconds. When the display shows 0000, the cost calculator has been reset. c. To enter a specific cost per kw Hr value, while displaying the Cost Calculator values above press and release the UP and DOWN buttons simultaneously. i. The display shows the cost per kw Hr as #.### (Factory Default 0.114) ii. Press the UP or DOWN button to adjust the cost per kw Hr. Holding the UP or DOWN buttons will fast scroll. iii. Press the UP and DOWN buttons simultaneously to lock in the cost per kw Hr. iv. Press the UP or DOWN button to return to Cost Calculator values. 28

29 v. Press the UP or DOWN button to return to normal display mode. 8. Error Code a. Err1, indicates a failure of element #1 b. Err2, indicates a failure of element #2 c. Err3, indicates a failure of element #3 d. Err4, indicates a failure of element #4 e. Err5, indicates a failure of the inlet thermistor f. Err6, indicates a failure of the outlet thermistor g. Err7, indicates a failure of the display unit to communicate with the main board h. Err8, indicates that water has been detected in the case Remote Display An optional remote display may be supplied and connected to the TK2000 control board as shown below. Priority and Remote Controls: Optionally, the tankless water heater may be connected to another electrical device max.) that will give priority to the water heater over that device to ensure that both do not operate at the same time and/or the tankless water heater may be wired to a remote switch, relay, or provided with a 24VDC signal (such as from a building maintenance system) to allow the tankless water heater to be remotely controlled. The diagram and description below provide details on how connections to the tankless water heater control board are to be made. 1. Priority Relay max.) a. When the unit is demanding power (calling for heat): i. The connection between the terminals marked C and NO are closed and will allow power to pass through. ii. The connection between the terminals marked C and NC are open and will not allow power to pass through. b. When the unit is not demanding power (not calling for heat): i. The connection between the terminals marked C and NO are open and will not allow power to pass through. ii. The connection between the terminals marked C and NC are closed and will allow power to pass through. 2. Remote Control a. When a 24VDC signal (5mA draw max.) is supplied between terminals P1 and P2, the heater will either operate or be inhibited (displayed as hld) as determined by the Remote Control settings as shown above. Loss of 24VDC signal has the opposite effect. b. When wired to a volt-free contact (10A max.) between terminal P2 and P3 (output signal opening or closing the contact will allow the heater to either operate or inhibit (displayed as hld) operation as determined by the Remote Control settings as shown above. 29

30 Power and Wiring Priority Relay NC NO C Outlet Inlet Leak Detection Display Remote Display F1 F2 F3 Flow Meter P1(0VDC) P2(+24VDC) P3 Remote Control Auxiliary TK2000 Control Board Wiring Detail 30

31 31

32 SECTION V TROUBLESHOOTING Initial Evaluation: No Hot Water or Water is not hot enough Is display lit? No Is circuit breaker or disconnect off? No Yes NOTE 1 To check for a plumbing crossover: Turn off power supply to the unit. Close installer supplied cold water shut-off valve (if none installed, install before proceeding). Open all hot water taps supplied by the unit. Wait 5 minutes and check all taps. Any water running is a sign of plumbing crossover. Yes Is there a plumbing crossover? (See note 1) No Yes Turn on circuit breaker or disconnect Consult a local plumber for help in correcting the plumbing crossover. Yes Replace Fuse Is control fuse open? See Advanced Troubleshooting No Is the temperature setting too low? Yes Adjust temperature setting See Section III. No Is flow too great for temp. setting? See Section II. Yes Reduce flow. No Is an anti-scald or tempering valve installed? No Yes An anti-scald or tempering valve automatically mixes cold water even when the faucet handle is turned to full hot. These devices are usually adjustable so the cold mix can be turned off completely. Alternatively, the temperature of the heater can be increased if hotter water is needed. For the final three steps, set the unit to diagnostic mode by pressing and releasing the UP and DOWN buttons simultaneously. Does i### match the actual inlet temp.? Yes Does o### match the actual outlet temp.? Yes With water flowing, does F##.# show 00.0? No No Yes Go to step 6 of Check the Go to step 6 of Check the Go to step 4 of Check the Flow Meter No See Advanced Troubleshooting 32

33 Advanced Troubleshooting: WARNING: Serious bodily injury or death may occur if the following warnings are ignored. This following portion of this section is intended for use by a QUALIFIED ELECTRICIAN. All circuit breakers must be turned off at the main panel before the cover of the unit is removed. This troubleshooting section will cover all the points that need to be checked from an electrical standpoint to ensure that the Hubbell tankless water heater is working correctly and to determine which component may need to be replaced. Tools Required: Phillips screwdriver Clamp multi-meter able to read voltage and amperage (amperage readings require a clamp type meter). Thermometer Pre-Operational Procedures: 1. With power to the unit turned ON, verify that the configuration settings are correct in accordance with the Temperature Controller User Interface Instructions in Section IV. 2. TURN OFF POWER AT THE MAIN PANEL. 3. Remove the cover by unscrewing the screws located on all sides of the unit. 4. Verify that the main power feed is properly connected to the power distribution block or magnetic contactor, as applicable. 5. Verify all connections are tight. Check the Power Supply to the Unit: 1. Turn on power to the unit from the main panel. 2. Check the incoming voltage between each phase at the line side of the power distribution block or magnetic contactor, as applicable. 3. If no voltage is present between all phases, verify that the breakers or disconnect on the main panel have been turned on. 4. If the breakers are on and there is still no voltage present or if the incorrect voltage or no voltage is present between any two phases, contact an electrician to troubleshoot the feed. 5. If all voltage readings are acceptable, proceed to Check the Transformer. Check the Transformer: 1. The transformer is utilized on units with supply voltages above 240 volts to supply a reduced voltage capable of powering the temperature controller. 2. If the display is lit or the unit is not equipped with a transformer (208 and 240 volt units), proceed to Check the Hi-Limit Thermostats. 3. Check the voltage on the primary side of the transformer. 4. If there is no voltage present, check the wiring and connections to the primary side of the transformer from the power distribution block or magnetic contactor, as applicable. 5. Check the voltage on the secondary side of the transformer. 6. If the secondary voltage does not conform to the table below, replace the transformer. 7. If all voltage readings are acceptable, proceed to Check the Hi-Limit Thermostats. 33

34 Primary Voltage Secondary Voltage (±5%) Note: The secondary voltage listed in the transformer is based the transformer being used at full capacity. Because there is essentially no load on the transformer, the secondary voltage will be higher than the voltage listed on the transformer. This regulation varies from 8.4% to 12% depending on the primary voltage and the transformer used. Check the Hi-Limit Thermostats: 1. The unit is supplied with safety hi-limit thermostats mounted on the plate that holds the heating chamber in place. In single phase units with no magnetic contactor, these thermostats allow the power from one phase of the terminal block to flow to the heating element. If the hi-limit thermostat fails it will not supply the heating element with power and therefore the heating element will not turn on and produce heat. In three-phase units or any unit with a magnetic contactor, the thermostats are wired in series to a magnetic contactor coil. If any hi-limit thermostat fails it will not supply power to the contactor coil and therefore no power will be supplied to any heating elements. 2. For single-phase units, check the voltage between the left-hand metal connection point of the thermostat and the metal plate. If shrink-wrap is present around the metal connection point to the hi-limit thermostat, cut back the shrink-wrap with a knife to expose the metal connection. A voltage reading around 120V should be indicated since this component is being fed by one leg of the electrical power coming off the terminal block. Perform this step on the left-hand connection of each hi-limit thermostat then again on the right-hand connection of each hi-limit thermostat If there is no voltage at the bottom of any hi-limit thermostat, then check the wiring and connections between that hi-limit thermostat and the power distribution block. 4. If correct voltage is present at the bottom of the hi-limit thermostat but no voltage is present at the top of the thermostat, then that hi-limit thermostat needs to be replaced. 5. If correct voltage is present on the top and bottom continue to Check the. 6. For three-phase units, if the magnetic contactor is pulled in, continue to Check the. Otherwise, starting at the left-hand connection of the lowest hi-limit thermostat, check the voltage between the metal connection point of the thermostat and the metal plate. 7. A voltage reading around 120V should be indicated. If no voltage is present at this point, check the wiring and connections to this hi-limit thermostat from the magnetic contactor or transformer, as applicable. 8. If correct voltage is present, check the voltage at the right-hand side of the thermostat, then the left-hand side of the thermostat above and continue this pattern to the uppermost thermostat.

35 9. If at any point there is voltage on the left-hand side and there is no voltage on the right-hand side of the same thermostat, replace that hi-limit thermostat. 10. If at any point there is voltage on the right-hand side of a thermostat and there is no voltage on the left-hand side of the thermostat above it, check the wiring and connections. 11. If all voltage readings are good and the contactor is not pulled in, check the wiring and connections between the right-hand side of the uppermost thermostat and the magnetic contactor coil. 12. If the wiring and connections are good, replace the magnetic contactor. Check the : 1. The thermistor is a temperature sensing device that changes resistance with changes in temperature. It is designed to register 150,000 at 25 C (77 F). 2. Set the unit to diagnostic mode by pressing and releasing the UP and DOWN buttons simultaneously. 3. With a thermometer, measure the temperature of the cold water and hot water at a fixture. 4. Compare the displayed inlet temperature (i###) to the measured cold water temperature and the displayed outlet temperature (o###) to the measured hot water temperature. If either of these readings is significantly different, continue with the next step. Otherwise, proceed to Check the Flow Meter. 5. At the right hand side of the temperature 350, , , , , ,000 50,000 controller are two terminal blocks. Disconnect the wires from the uppermost terminal block (outlet thermistor). Using the multi-meter probes with the setting at OHMS or, place one probe on the end of one wire and the other probe on the end of the other wire. An ohms reading consistent with the chart below for the approximate temperature of the water should be indicated. NOTE: Alligator clips should be used. Holding the wires in your hands will give a false reading. Reconnect the wires Outlet Inlet Chart 25 C (77 F)) Temperature, F ( C) Ohms, 50 (10.0) 299, (15.6) 229, (21.1) 178, (26.7) 139, (32.2) 110, (37.8) 87, (43.3) 70, (48.9) 56, (54.4) 46, (60.0) 38, (65.6) 31, (71.1) 26, (76.7) 21, (82.2) 18, (87.8) 15, Repeat the above step with the lower terminal block (inlet thermistor). 7. If either of these readings is not consistent with the chart (within ±10,000 ), replace that thermistor. 8. If all ohms readings are acceptable, proceed to Check the Flow Meter. 35

36 Check the Flow Meter: 1. Set the unit to diagnostic mode by pressing and releasing the UP and DOWN buttons simultaneously. 2. Turn on a hot water tap at a fixture that will ensure a good flow rate through the unit. 3. If the flow rate on the display reads F00.0 then continue with the next step. Otherwise, proceed to Check the Temperature Controller. 4. Verify that the wiring from the flow switch is connected to the control board in the order WHITE/GREEN/BROWN from left to right. 5. With no flow on the unit, using the multi-meter probes with the setting at Volts Direct Current, place one probe on the terminal block where the WHITE wire is connected (F1) and the other probe where the BROWN wire is connected (F3). A voltage reading in the appropriate range (9V) should be indicated. 6. If the voltage reading is not in the appropriate range (9V), replace the temperature controller. 7. Turn on a hot water tap at a fixture that will ensure a good flow rate through the unit and using the multi-meter probes with the setting at Volts Direct Current, place one probe on the terminal block where the WHITE wire is connected (F1) and the other probe where the GREEN wire is connected (F2). A voltage reading in the appropriate range (4.5V) should be indicated. 8. If the voltage reading is not in the appropriate range (4.5V), replace the flow meter. 9. If all voltage readings are acceptable, proceed to Check the Temperature Controller. Check the Temperature Controller: 1. At the top of the temperature controller there are 4 sets of terminal blocks. Verify the wiring is correct as indicated in the wiring diagram specific to the model. 2. Check the voltage between the terminal block where the BLACK wire is connected (this will be the leftmost terminal) and the metal heater chamber cover. A voltage reading in the appropriate range (120V) should be indicated. 3. If no voltage is present, verify that the BLACK wire in the terminal block is properly tightened and verify that the opposite end, this will be a RED wire, is properly connected to the power distribution block, magnetic contactor, or transformer, as applicable. 4. Check the voltage between the terminal block where the BLACK wire is connected at the second terminal from the left and the metal heating chamber cover. A voltage reading in the appropriate range (120V) should be indicated. Repeat this step for each of the wires connected to the terminal blocks. 5. If no voltage is present, verify that the BLACK wire in the terminal block is properly tightened and verify that the opposite end, this will be a RED wire, is properly connected to the power distribution block, magnetic contactor, or transformer, as applicable. 6. If voltage is present where the black wires connect to the terminals and there is no display, replace the temperature controller. 7. Check the voltage between each additional wire from left to right and the metal heating chamber cover. A voltage reading in the appropriate range (one half of the incoming power voltage, i.e. if the incoming power is 480V, then the reading should be 240V) should be indicated. 8. If no voltage is present, verify that the BLACK wires in the terminal block are properly tightened and verify that the opposite ends of the BLACK wires are properly jumpered to the previous BLACK wire connection terminal or properly connected the magnetic contactor, as applicable. 9. Turn on a hot water tap at a fixture that will ensure a good flow rate through the unit and set the temperature at the highest setting so the unit calls for full power. 10. Check the voltage between the terminal block where the first YELLOW wire is connected from left to right and the metal heating chamber cover. A voltage reading in the appropriate range (one half of the incoming power voltage, i.e. if the incoming 36

37 power is 480V, then the reading should be 240V) should be indicated. Repeat this step for each of the YELLOW wires. 11. If no voltage is present on any one of the YELLOW wires, replace the temperature controller. 12. If all voltage readings are acceptable, proceed to Check the s (Step 1). Check the s (Step 1): 1. The triacs are the switching mechanism for turning the heating elements on and off. 2. Turn on a hot water tap at a fixture that will ensure a good flow rate through the unit and set the temperature at the highest setting so the unit calls for full power. 3. Check the voltage between the two wires that are connected to the top of the heating element. A voltage reading in the appropriate range (equal to the incoming line voltage) should be indicated. 4. If no voltage is present on any heating element, the triac connected to that element should be replaced. 5. If all voltage readings are acceptable, proceed to Check the s. Check the s: 1. To check the heating element the amperage draw from each heating element must be verified. To do this the unit must be operating. 2. Turn on a hot water tap at a fixture that will ensure a good flow rate through the unit and set the temperature at the highest setting. 3. Using a clamp-on multi-meter, clamp the meter around one of the RED wires going to the lowest heating element. The reading should be as indicated (±5%) based on the specific model listed in the Electrical Specification table in the Installation section. 4. Repeat for all the heating elements. 5. If any amp reading is not within the range as indicated in the chart, that heating element should be replaced. 6. If all readings are within range continue to Check the s (Step 2). Check the s (Step 2): 1. Turn off the flow of hot water. 2. Using a clamp-on multi-meter, clamp the meter around one of the RED wires going to the lowest heating element (same as in step 3 of Check the s). The reading should be zero. Repeat for all the heating elements. 3. If any reading is not zero with the hot water turned off, then that triac should be replaced. Contact the Factory: 1. If you were unable to determine the problem from the above troubleshooting, please have the electrician contact the factory. 37

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